EV Roaming Hub Explained: How EV Charging Networks Actually Connect and Scale

As EV charging networks expand, one concept becomes unavoidable: the EV roaming hub.

For Charge Point Operators (CPOs), roaming hubs are often discussed as a requirement rather than a strategic choice. For Demand Partners, they are often invisible. Yet roaming hubs sit at the center of how EV charging scales beyond isolated networks.

This article explains what an EV roaming hub really is, how it works technically, the business models that exist today, and why the next generation of roaming hubs — including NetworkCore — looks fundamentally different.

What Is an EV Roaming Hub?

At a basic level, an EV roaming hub is a platform that enables interoperability between different EV charging networks.

Instead of every CPO integrating bilaterally with every app, OEM, or fleet, a roaming hub provides a shared connection layer. This turns a fragmented ecosystem into a many-to-many network.

Without roaming hubs, EV charging would scale linearly. With them, it scales exponentially.

The Technical Foundation of an EV Roaming Hub

To understand an EV roaming hub properly, it helps to break down the core technical components.

OCPI: The Backbone of Roaming

Most modern roaming hubs rely on OCPI (Open Charge Point Interface).

OCPI enables:

• Exchange of charger location data
• Tariff visibility
• Session start and stop
• Session reporting
• Status updates

For CPOs, OCPI allows a single technical interface to reach many partners. For DPs, it enables access to many networks without bespoke integrations.

OCPI standardised how systems talk — but not how money moves.

Plug & Charge (ISO 15118)

Plug & Charge adds a second technical layer.

Instead of authenticating via apps, cards, or RFID, Plug & Charge allows the vehicle itself to authenticate using digital certificates.

From a roaming hub perspective:

• The hub must support certificate exchange
• Trust chains must be maintained
• Contract issuance must be recognised
• Authorisation must be near-instant

Plug & Charge improves user experience, but it does not replace roaming hubs. It simply changes how the identity layer works.

Roaming hubs still orchestrate:

• Which network is used
• Which tariff applies
• Who settles the transaction

Many-to-Many Connectivity

A key value of an EV roaming hub is many-to-many connectivity.

Instead of:

• 1 CPO ↔ 1 app
• 1 CPO ↔ 1 OEM

Roaming hubs enable:

• Many CPOs ↔ many DPs
• One integration ↔ many commercial relationships

This reduces:

• Integration costs
• Maintenance overhead
• Time to market

This is the technical foundation that makes global EV charging possible.

What Traditional EV Roaming Hubs Do Well

Traditional roaming hubs have played a critical role in the industry.

They successfully:

• Enabled cross-network charging
• Reduced bilateral integrations
• Standardised data exchange
• Improved driver access

For CPOs, this unlocked utilisation beyond their own customer base. For DPs, it enabled broader coverage.

However, as EV charging volumes grow, the limitations of traditional roaming hubs become more visible.

Where Traditional Roaming Hubs Stop

Most legacy roaming hubs focus almost exclusively on technical roaming.

They typically:

• Exchange data
• Relay authorisation requests
• Forward session records

What they often do not handle end-to-end:

• Payment collection
• Revenue splitting
• FX
• VAT and invoicing
• Settlement timing
• Incentive alignment
• Work on public price

As a result, CPOs and DPs are left to manage:

• Opaque pricing with bilateral financial agreements
• Slow payouts
• Complex reconciliation
• Expensive fee structures – the more users the more expensive

This is where EV roaming hubs, as traditionally designed, reach their ceiling.

EV Roaming Hub Business Models Today

From a commercial perspective, most roaming hubs operate on SaaS-style models.

Common structures include:

• Fixed annual or monthly fees
• Per-connector pricing
• Per-session fees
• Tiered subscriptions

While predictable, these models have drawbacks:

• Costs exist even when utilisation is low
• Incentives are not aligned with usage
• Expansion into new markets carries upfront risk
• Smaller CPOs are disadvantaged

As charging scales, these models start to feel misaligned with how the ecosystem actually earns money.

NetworkCore's Evolution of the EV Roaming Hub

NetworkCore takes a fundamentally different approach to what an EV roaming hub should be.

Technically, NetworkCore:

• Supports OCPI-based roaming
• Works with Plug & Charge ecosystems
• Enables many-to-many connectivity
• Integrates seamlessly with existing CSMS platforms

But the real difference is what happens after the session starts.

From Data Roaming to Financial Roaming

NetworkCore extends the roaming hub from a data exchange layer into a clearing and settlement layer.

This means:

• Applies public charging prices
• NetworkCore collects the payment
• Splits revenue automatically
• Handles FX where needed
• Issues compliant invoices
• Settles funds faster and transparently

For CPOs, this directly addresses one of the biggest operational pain points: cash flow and reconciliation.

Commission-Only Instead of SaaS Fees

Unlike traditional roaming hubs, NetworkCore does not charge fixed SaaS fees.

Its model is commission only:

• No upfront fees
• No fixed subscriptions
• No per-connector pricing
• No ongoing minimums

If charging happens, everyone earns.
If charging does not happen, no one pays.

This aligns incentives across:

• CPOs (utilisation and fast payout)
• DPs (usage-based Revenue and transparency and trust building)
• NetworkCore (volume-driven scale)

Why This Matters for CPOs

For CPOs, an EV roaming hub is no longer just about access. It is about economics.

A modern roaming hub should:

• Increase utilisation
• Improve liquidity
• Reduce reconciliation effort
• Support cross-border growth
• Preserve pricing transparency

NetworkCore is built with these outcomes in mind.

Why DPs Should Care Too

While this article is CPO-focused, DPs benefit from the same shift.

A roaming hub that handles settlement and pricing properly:

• Enables embedded charging (see our post: embedded services for fintechs)
• Preserves user trust
• Simplifies expansion
• Creates predictable revenue

This is why EV roaming hubs are becoming strategic infrastructure, not just technical middleware.

EV Roaming Hub Explained, Simply

An EV roaming hub used to mean:

"A way to let drivers charge on other networks."

Today, an EV roaming hub increasingly means:

"The infrastructure that determines how money, trust, and scale move across EV charging."

That distinction defines the next phase of the industry.

Final Thought

EV charging will only scale globally if roaming hubs evolve beyond data exchange.

The future belongs to roaming hubs that:

• Understand payments
• Build transparency and trust in the EV ecosystem
• Align incentives
• Move money efficiently
• Support both CPOs and DPs

NetworkCore represents this evolution.

Not by replacing existing systems but by completing the roaming hub model the industry needs. NetworkCore offers EV Charging as a Service.